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Quasars, an abbreviation for quasi-stellar radio sources, are distant objects that look like stars through a telescope but that emit far more
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Chapter 36 Solutions
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- A spaceship is coming directly toward you while you are in the International Space Station. You are told that the spaceship is shining sodium light (with an intense yellow doublet of wavelengths 588.9950 and 589.5924 nm). You have an apparatus that can resolve two closely spaced wavelengths if the difference is ∆λ < 0.55 nm. If you fi nd that you can just resolve the doublet, how fast is the spaceship traveling with respect to you?arrow_forwardYou want a telescope that discerns objects that are at least 5.10 * 10-7 radians apart. To achieve this resolution, determine what the diameter of the primary mirror must be if you are making observations at a wavelength of 583 nm. A binary star system is 41.3 ly away. the two stars would just barely be able to be discerned by your telescope. determine the minimum distance between the stars. ly = 9.461 *1015arrow_forwardhelp me please, this is my review for my exam tomorrowarrow_forward
- An experimenter stands along a line between two firecrackers that are 1500 m apart. The two firecrackers explode simultaneously. She sees the flash of the light from the firecracker to her left 1.0 μs before she sees the flash from the firecracker to her right. Where is the experimenter standing?arrow_forwardYou're inside a metal building that blocks radio waves, but you're trying to make a call with your cell phone, which broadcasts at a frequency of 950 MHz. Down the hall from you is a narrow win- dow measuring 35 cm wide. What's the horizontal angular width of the beam (i.e., the angle between the first minima) from your phone as it emerges from the window?arrow_forwardMr. Hadi sent an email using 01 Gbps network bandwidth which contained a message size of 2.5-KB (Kilobyte) . Mr. John is X km away from sender (where X =172) who received email at speed of light travels at 2.4 × 108 m/s. You may need to calculate propagation time and the transmission time for the entire communication, and also discuss the dominant factor in this communication. Draw the figure by labelling all above mentioned values and add screen shot in your answer along with your solution.arrow_forward
- Often in optics scientists take advantage of effects that require very high intensity light. To get the desired effect a scientist uses a laser with power P = 0.0015 W to reach an intensity of I = 350 W/cm2 by focusing it through a lens of focal length f = 0.15 m. The beam has a radius of r = 0.0011 m when it enters the lens.Randomized VariablesP = 0.0015 WI = 350 W/cm2f = 0.15 mr = 0.0011 m Part (a) Express the radius of the beam, rp, at the point where it reaches the desired intensity in terms of the given quantities. (In other words, what radius does the beam have to have after passing through the lens in order to have the desired intensity?) Part (b) Give an expression for the tangent of the angle that the edge of the beam exits the lens with with respect to the normal to the lens surface, in terms of r and f? Part (c) Express the distance, D, between the lens's focal point and the illuminated object using tan(α) and rp. Part (d) Find the distance, D, in centimeters.arrow_forwardChapter 33, Problem 003 Z Your answer is partially correct. Try again. From the figure, approximate the (a) smaller and (b) larger wavelength at which the eye of a standard observer has half the eye's maximum sensitivity. What are the (c) wavelength, (d) frequency, and (e) period of the light at which the eye is the most sensitive? 100 80 60 40 20 400 450 500 550 600 650 700 Wavelength (nm) (a) Numbel o Units T510 Inm (b) Number Units Tnm 1610 (c) Numbel T550 Units Thm (d) Numbel545454550000000 Units THZ (e) Number Units p.00183 Relative sensitivityarrow_forwardChapter 33, Problem 003 Z Your answer is partially correct. Try again. From the figure, approximate the (a) smaller and (b) larger wavelength at which the eye of a standard observer has half the eye's maximum sensitivity. What are the (c) wavelength, (d) frequency, and (e) period of the light at which the eye is the most sensitive? 100 80 60 40 20 400 450 500 550 600 650 700 Wavelength (nm) (a) Numbel510 Units Inm (b) Numbel T610 Units Inm (c) Numbel T550 Units Inm (d) Number 5.45 Units (e) Number [27.75 Units Reative sensitivityarrow_forward
- The Great Wall of China is an enormous structure, its width approaching 7.0 m at the widest point. Some people claim that it ispossible to identify the separate sides of the Great Wall from theMoon with the unaided eye. Evaluate this claim in the following way:Assume that green light (λ vac = 555 nm) reflects from the Great Walland enters the eye of an astronaut (D = 2.5 mm, n = 1.36).Determine the maximum distance this astronaut could be from Earthand still resolve the two sides at their widest point. Compare thismaximum distance to the distance between Earth and Moon (3.85x10 8 m).arrow_forwardGallium arsenide (GaAs) is an expensive alloy used for high performance multijunction solar cells. A certain GaAs absorber layer is designed to absorb 95% of the incident red light = 700 nm. The complex refractive index of GaAs at this wavelength is given by ñGaAs = 3.77+ i0.141. By what fraction can the thickness of the GaAs absorber layer be decreased, if we introduce a lambertian scatterer at the front of the absorber layer and an ideal reflector at the back? Give a percentage [%]arrow_forwardGiven once SpaceX's StarLink can provide global internet by sending light between satellites in space, what is the expected time delay for a Whatsapp call from Indianapolis to London which is about 6416 km apart? In other words, how long does light need to travel between Indianapolis and London? µs = 1 × 10¬°s, ms = 1 × 10¬³s tdelay = 2.14µs tdelay = 2.14ms %3D tdelay = 214µs O tdelay = 2.14s %3Darrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning